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GASA, a gibberellin-regulated gene family from Arabidopsis thaliana related to the tomato GAST1 gene

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Abstract

A multiple gene family of at least four members, related to a GA-stimulated transcript (GAST1) from tomato, was characterized in Arabidopsis thaliana by analysing four related cDNAs, named GASA1 to GASA4. The corresponding peptides display comparable structural features: (1) a putative signal peptide of 18 to 23 residues; (2) a highly divergent hydrophilic region of about 22 amino acids; (3) a conservative 60 amino acid C-terminal domain containing 12 cysteines. This organization has also bean shown in two related peptides from tomato, GAST1 found in shoots and RSI-1 found in early lateral roots. Southern blot hybridization patterns showed single-copy genes for all four members of the GASA family. Accumulation of the various transcripts, monitored by northern blot hybridization, indicated that the various genes are expressed differentially in plant organs. Specific mRNAs were mostly detected in flower buds and immature siliques in the case of GASA1, in siliques and dry seeds in the case of GASA2 and 3, and in growing roots and flower buds in the case of GASA4. At least two of the GASA genes are activated in GA-deficient mutant ga5, as early as 4 to 8 h after spraying with 50 μM GA3. The complex patterns of expression and regulation of the various genes suggest that the related peptides are involved in a developmental regulation process in Arabidopsis.

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Authors and Affiliations

  1. Laboratoire de Biologie Moléculaire Végétale, CNRS URA 1178, Université Joseph Fourier, CERMO, BP 53X, F-38041, Grenoble, France

    Michel Herzog & Anne-Marie Dorne

  2. Laboratoire de Physiologie et Biologie Moléculaire Végétales, CNRS URA 565, Université de Perpignan, 52 avenue de Villeneuve, F-66860, Perpignan, France

    Françoise Grellet

Authors
  1. Michel Herzog
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  2. Anne-Marie Dorne
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  3. Françoise Grellet
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Herzog, M., Dorne, AM. & Grellet, F. GASA, a gibberellin-regulated gene family from Arabidopsis thaliana related to the tomato GAST1 gene. Plant Mol Biol 27, 743–752 (1995). https://doi.org/10.1007/BF00020227

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  • DOI: https://doi.org/10.1007/BF00020227

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